EP4048961A1 - Dispositif de détendeur destiné à un circuit de réfrigération ou un circuit de climatisation - Google Patents

Dispositif de détendeur destiné à un circuit de réfrigération ou un circuit de climatisation

Info

Publication number
EP4048961A1
EP4048961A1 EP19795505.7A EP19795505A EP4048961A1 EP 4048961 A1 EP4048961 A1 EP 4048961A1 EP 19795505 A EP19795505 A EP 19795505A EP 4048961 A1 EP4048961 A1 EP 4048961A1
Authority
EP
European Patent Office
Prior art keywords
valve
shut
refrigeration
air conditioning
conditioning circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19795505.7A
Other languages
German (de)
English (en)
Inventor
Hans Gerards
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP4048961A1 publication Critical patent/EP4048961A1/fr
Pending legal-status Critical Current

Links

Definitions

  • the invention relates to an expansion valve device for a refrigeration or air conditioning circuit with a control valve consisting of a flow housing with an inlet and an outlet, an actuator via which a coupling element with a control body can be moved axially, at least one first flow cross section between the inlet and the outlet, which is surrounded by a valve seat and which can be closed and released by means of the control body.
  • Expansion valves are used to reduce the pressure of the working fluid by throttling the available flow cross-section and to increase the volume of the working fluid, i.e. to expand it.
  • regulated expansion valves both the pressure drop and thus the increase in volume can be regulated and the fluid flow can be almost completely interrupted.
  • valves are arranged upstream of the evaporators and downstream of the condensers. Due to the increase in volume, the working fluid is partially evaporated, while the still liquid working fluid in the evaporator absorbs heat, whereby the liquid part also evaporates. This working fluid, which is now gaseous, is fed to a compressor and compressed so that it is then converted back into the liquid state in the liquefier, creating the closed circuit. Heat or cold can be drawn from this circuit in the area of the evaporator and condenser.
  • an expansion valve which is regulated electromagnetically.
  • the axially movable control body of this The valve is piston-shaped and regulates a first and a second flow cross-section between an inlet and the outlet.
  • An annular gap is formed between the valve seats, which radially delimit the flow cross-sections, through which the refrigerant can flow from the inlet to the outlet between the essentially piston-shaped regulating body and the valve seats.
  • shut-off valve in a refrigerant circuit, which shut-off valve is held in a closed position by the applied pressure difference.
  • a control valve is disclosed, for example, in EP 0 689 015 A1.
  • This control valve consists of a check valve with a built-in pilot valve. This means that the valve is held in the closed position by the applied pressure difference and two springs that load the pilot valve member and the check valve member in the closing direction.
  • a pin that can be actuated via an electromagnet is pushed to open the spherical pilot valve member so that it is lifted from its seat and pressure can be equalized between the front and the rear of the check valve.
  • the check valve can then be lifted off the valve seat with a relatively small actuation force and a flow cross-section between the inlet and the outlet can thus be regulated.
  • the task is to provide an expansion valve and a reliable shut-off of the refrigerant circuit, whereby the number of components and the required installation space should be reduced and the lowest possible actuating forces should be required, so that the size and power consumption of the actuators used should also be required can be reduced.
  • a good expansion effect of the fluid should be achieved through the best possible atomization with precise volume flow regulation, losses due to volume jumps should be avoided.
  • the expansion valve device has a control valve, on the flow housing of which an inlet and an outlet for the refrigerant are formed.
  • An actuator moves a coupling element axially, which, for example, can be designed as a valve rod and is coupled to the control body.
  • the regulating body is either attached to the coupling element or formed in one piece or in one piece with it. At least one flow cross-section is formed between the inlet and the outlet, which is surrounded by a valve seat and which can be regulated by means of the regulating body.
  • the expansion valve device has a shut-off valve which is fluidically arranged between the inlet and the control valve.
  • shut-off valve In terms of flow, between the inlet and the control valve means that when the control valve and the shut-off valve are open, a fluid flows from the inlet via the shut-off valve to the control valve and from there to the outlet.
  • the shut-off valve has a closing body which is pressed onto a valve seat. This means that both the shut-off valve and the control valve are actuated by the same actuator. This reduces both the space required and the number of components required. However, with very good atomization, a reliable and secure closure can still be produced without active actuation of the actuator, since the pressure difference that is present always has a closing effect.
  • the shut-off valve preferably has a pilot valve body, which by actuating the actuator of the control valve via the Coupling element is movable.
  • the pilot valve body is first lifted from its valve seat by the coupling element and, with further axial displacement, the closing body of the shut-off valve is also lifted.
  • the actuation forces are kept very low, since a pressure equalization is initially generated on the shut-off valve on the shut-off valve by actuating the pilot valve.
  • the shut-off valve In the closed state, however, the shut-off valve is tightly sealed, since the pressure difference also always has a closing effect. Even for the actuation of the control valve, only small actuating forces are required, so that the actuator can be operated with a small size.
  • the coupling element is preferably axially displaceable in such a way that in a first adjustment range of the actuator the coupling element is axially spaced from the pilot valve body, in a second adjustment range the pilot valve body is axially displaced and lifted from its valve seat and in a third adjustment range the closing body is removed from a valve seat of the shut-off valve is lifted.
  • the pilot valve remains completely closed in the first adjustment range, while in the second adjustment range a pressure equalization between the front and the rear of the closing body of the shut-off valve is achieved by opening the small cross section by lifting the pilot valve body, through which the required opening forces to open the closing body are achieved can be significantly reduced in the third adjustment range.
  • the control valve can also be moved between the valve seats at the same time or slightly afterwards in such a way that a flow cross-section is opened and thus a connection is established between the inlet and the outlet.
  • This can be easily achieved, for example, in that in the rest position with the shut-off valve and the control valve closed, a contact surface of the coupling element that is to be brought into contact with the pilot valve body has a smaller axial distance from the pilot valve body than a contact surface of the coupling element that is to be brought into contact with the closing body of the shut-off valve to the closing body of the Shut-off valve.
  • a valve is created because the control valve has a second valve seat which surrounds a second flow cross section between the inlet and the outlet, the two flow cross sections being jointly closable and releasable by the one control body and an annular gap being formed axially between the two valve seats , on whose control body the same pressure acts from both axial sides.
  • Both flow cross-sections are regulated by the one regulating body and can be almost completely closed at the same time.
  • the very small cross-sections to be controlled create a very good atomization effect, so that a relatively high proportion of gaseous fluids is created.
  • very precise volume flow control is possible. Accordingly, only small actuating forces are required to open the control valve.
  • the regulating body preferably has a piston-shaped section, the height of which corresponds at least to the distance between the two valve seats and the diameter of which substantially corresponds to the inner diameter of the two valve seats.
  • the piston-shaped section is followed by a section of the control body that is conically contoured in the direction of the actuator. When this conically contoured section is introduced into the flow cross-sections, very small cross-sections can be exposed, whereby a very precise controllability of the volume flow is achieved even with small volume flows.
  • the shut-off valve is preferably designed as a check valve, the closing body of which is loaded against the valve seat by a spring. It is accordingly an actuatable check valve which, after pressure equalization, is held in its closed position by the spring force by opening the pilot valve, so that the actuating forces can be determined very precisely. As long as the pilot valve is closed, the shut-off valve is always loaded in the closing direction by the applied pressure difference, whereby a closure is reliably ensured. Even if the actuator fails, the shut-off valve remains in its closed position.
  • the closing body preferably has an opening which can be closed by the pilot valve body of the shut-off valve, which is loaded by a spring against a valve seat formed on the closing body and surrounding the opening.
  • the function of the pilot valve and thus a simple pressure equalization between the two sides of the shut-off valve is implemented in a simple manner, so that the actuating forces can be kept low, since only small forces are required to move the pilot valve body, which has only a small cross section.
  • the pilot valve body is needle-shaped and has a shoulder against which the spring rests biased, the opposite end of which rests against a support surface which is formed on a wall which extends axially from the closing body in a direction facing away from the actuator extends. So can little ones Cross-sections of the pilot valve body can be realized and still a guidance of the body can be ensured without the closing body of the shut-off valve having to be made larger. Accordingly, the valve only requires a small amount of space.
  • the annular gap preferably merges radially outward into an annular channel which is formed between valve seat housing parts on which the valve seats of the control valve are formed, whereby a uniform flow against the annular gap is achieved and thus a uniform flow through the flow cross-sections when the valve is opened. This also promotes the accuracy of the regulation and prevents losses due to sudden relaxation.
  • the inner diameter of the valve seat housing parts increases in a nozzle-like manner with increasing distance from one another, so that a gradual increase in volume occurs.
  • the inlet is preferably arranged on a side of the shut-off valve remote from the control valve and a space is formed between the valve seats and the shut-off valve, which can be connected to the outlet via the control valve and to the inlet via the shut-off valve.
  • Such an expansion valve device has a simple structure. No additional connecting lines or the like are required, so that the installation space and the number of components are reduced compared to known designs.
  • the actuator is advantageously an electromagnetic or electromotive actuator via which the coupling element can be moved.
  • Electromagnetic or electromotive actuators enable very precise regulation, are robust in construction and enable actuating forces that are independent of the load condition of the vehicle.
  • An expansion valve device is thus created which is very compact and combines the functions of a shut-off valve with a control valve when only one actuator is used.
  • the control valve can be switched precisely and quickly, while the shut-off valve has a high degree of tightness and, due to the use of the pilot valve, can be switched with very little forces.
  • a very good atomization effect is achieved with a high proportion of the desired change in the physical state of the fluid
  • FIG. 1 An embodiment of an expansion valve according to the invention for a refrigeration or air conditioning circuit is shown in the figure and is described below.
  • the figure shows a section of a side view of an expansion valve according to the invention in a sectional illustration.
  • the expansion valve device has an electromagnetic actuator 10 with an actuator housing 12.
  • the electromagnetic actuator 10 has a coil 16 which is wound on a coil body 14 and which can be connected to a voltage source via a plug which is not visible.
  • the electromagnetic force to be generated by the coil 16 is transmitted via a yoke 18, return plates 20 and a core 22 to an axially movable armature which is arranged at the end of the core 22 opposite to a valve unit 24 and in the direction of which the armature when energized in is drawn in a known manner.
  • the armature is coupled for movement with a coupling element 26 in the form of a valve rod. This means that the coupling element 26 executes a movement corresponding to the movement of the armature.
  • the core 22 attached to the return plate 20 has a central, axially extending opening 28 through which the coupling element 26 consists of a Armature space protrudes into a valve housing 30.
  • This valve housing 30 is clamped axially between an inner plug-in housing part 32 of a flow housing 34 and the core 22.
  • the valve housing 30 is surrounded radially by the plug-in housing part 32 which, with a sealing ring 36 in between, also surrounds the end of the core 22 facing the valve housing 30.
  • a radial inlet 40 and a radial outlet 42 are formed on the flow housing 34, which consists of the inner plug-in housing part 32 and an outer flow housing part 38 surrounding it.
  • the plug-in housing part 32 is radially surrounded by the outer flow housing part 38 with the interposition of two sealing rings 44, 46 and axially limited to the side opposite to the actuator 10.
  • the coupling element 26 has a piston-shaped section 48, which is adjoined by a section 50 which is conically contoured in the direction of the core 22, the sections 48, 50 serving as a regulating body 52 of a regulating valve 54.
  • the control body 52 is loaded by a helical spring 55 in the direction of the actuator 10 and thus in its position closing the control valve 54 and acts with a first valve seat 56, which is formed on the inner diameter of a first valve seat housing part 58 of the valve housing 30, and a second valve seat 60, which is formed on the inner diameter of a second valve seat housing part 62 of the valve housing 30, together.
  • a through hole 63 is formed in the second valve seat housing part 62, through which a space 98 below the second valve seat 60 and a space 99 above the first valve seat 56 are connected to one another.
  • the two valve seats 56, 60 each have an inner diameter which essentially corresponds to the diameter of the piston-shaped section 48 of the regulating body 52, so that the piston-shaped section 48 in the de-energized state of the actuator 10 has both a first flow cross section 64 within the first valve seat 56 and a also closes a second flow cross section 66 within the second valve seat 60.
  • the actuator 10 When the actuator 10 is energized, the piston-shaped section 48 of the control body 52 is pushed out of the valve seats 56, 60 so that the gap-shaped flow cross-sections 64, 66 between the conically contoured section 50 of the control body 52 and the valve seats 56, 60 are released.
  • the valve seat housing parts 58, 62 each have a nozzle shape on the inner diameter, so that the inner diameter from the valve seats 56, 60 on the valve seat housing parts 58, 60 widens in a nozzle-like manner with increasing distance from one another.
  • the fluid After flowing through these gap-shaped flow cross-sections 64, 66, the fluid enters an annular gap 68 between the two gap-shaped flow cross-sections 64, 66, which widens into an annular channel 70, from where the fluid can flow to the outlet 42. Very good atomization takes place through the narrow gaps.
  • shut-off valve 72 is arranged in the plug-in housing part 32 of the flow housing 34.
  • This shut-off valve 72 is designed in the form of a check valve, the closing body 74 of which is pressed by means of a spring 76 against a valve seat 78 on the plug-in housing 32 and additionally has a pilot valve body 80.
  • This pilot valve body 80 has a needle-shaped section 82 which protrudes through an opening 84 in the closing body 74 which is surrounded by a pilot valve seat 86.
  • a closing section 85 rests against the pilot valve seat 86 and adjoins the needle-shaped section 82 of the pilot valve body 80.
  • a spring 88 loads the closing section 85 via a shoulder 90, on which the spring 88 rests, against the pilot valve seat 86, in that the opposite end of the spring 88, which acts in the same direction as the spring 76, rests on a bearing surface 92
  • Closing body 74 is supported, which at the end of a axially from the closing body 74 in a from Actuator 10 facing away direction extending wall 89 is formed.
  • this pilot valve body 80 is always loaded relative to the closing body 74 of the shut-off valve 72 in the closing direction.
  • the shut-off valve 72 is actuated by means of the coupling element 26, via which the control valve 54 is also actuated and thus by actuation of the actuator 10.
  • the coupling element 26 extends axially over the control body 52 until just before the needle-shaped section 82 of the pilot valve body 80.
  • a first contact surface 94 is formed, which is complementary to the opposite axial end of the needle-shaped section 82 of the pilot valve body 80 is formed.
  • This first contact surface 94 is surrounded radially by an axially extending annular projection of the coupling element 26, the axial end of which serves as a contact surface 96 for the closing body 74 of the shut-off valve 72.
  • the distance between the first contact surface 94 and the pilot valve body 80 is smaller than the distance between the second contact surface 96 and the closing body 74 of the shut-off valve 72, so that the pilot valve body 80 is always actuated first. Furthermore, in the rest position, the distance between the second contact surface 96 and the closing body 74 of the shut-off valve 72 is less than or equal to the length of the piston-shaped section 48 of the control body 52, which is located on the side of the shut-off valve 72 facing away from the first valve seat 56, so that the control valve 54 only opens when the shut-off valve 72 is also open.
  • valve seat housing parts 58, 62 and the valve seat 78 of the shut-off valve 72 are fluidically arranged between the inlet 40 and the outlet 42.
  • the control body 52 rests with its piston-shaped section 48 radially on the two valve seats 56, 60, so that a connection between the inlet 40 and the outlet 42 is blocked.
  • this shut-off is often not sufficiently tight, since the piston-shaped section 48 must remain movable within the valve seats 56, 60, so that a certain gap must always be provided.
  • shut-off valve 72 is provided, in which a tight seal is achieved through the planar and axial support of the pilot valve body 80 on the pilot valve seat 86 and the axial support of the closing body 74 on the valve seat 78, which is produced by the springs 76, 88 is achieved.
  • the armature and thus the coupling element 26 is moved in a first adjustment range in the direction of the needle-shaped section 82 of the pilot valve body 80 until the contact surface 94 of the coupling element 26 rests and the pilot valve body 80 begins in a second adjustment range from its pilot valve seat 86 against the force of the spring 88 take off.
  • Such an expansion valve device for a refrigeration or air conditioning circuit thus enables a secure closure with good atomization properties when conveyance is not desired.
  • the expansion valve device can be regulated very precisely, for which only small actuating forces are required. Accordingly, small actuators can be used.
  • the number of components is very small, since only one actuator is required for the shut-off valve and the control valve. Accordingly, this compact expansion valve device only requires a small amount of space.

Landscapes

  • Fluid-Driven Valves (AREA)

Abstract

L'invention concerne des dispositifs de détendeur destinés à des circuits de réfrigération ou de climatisation. Lesdits dispositifs comprennent une soupape de commande (54) qui est constituée d'un carter d'écoulement (34) doté d'une entrée (40) et d'une sortie (42), d'un actionneur (10) par l'intermédiaire duquel un élément de couplage (26) ayant un corps de commande (52) est mobile axialement, et au moins d'une première section transversale d'écoulement (64) entre l'entrée (40) et la sortie (42), qui est entourée par un siège de soupape (56) et qui peut être fermée et ouverte au moyen du corps de commande (52). Afin d'interrompre complètement et de manière fiable un écoulement de fluide entre l'entrée et la sortie sans nécessiter d'actionneurs supplémentaires, le dispositif de détendeur comprend une soupape d'arrêt (72) qui est située en communication fluidique entre l'entrée (40) et la soupape de commande (54) et qui présente un élément de fermeture (74) qui peut être déplacé par l'intermédiaire de l'élément de couplage (26) par actionnement de l'actionneur (10) de la soupape de commande (54).
EP19795505.7A 2019-10-23 2019-10-23 Dispositif de détendeur destiné à un circuit de réfrigération ou un circuit de climatisation Pending EP4048961A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/078856 WO2021078375A1 (fr) 2019-10-23 2019-10-23 Dispositif de détendeur destiné à un circuit de réfrigération ou un circuit de climatisation

Publications (1)

Publication Number Publication Date
EP4048961A1 true EP4048961A1 (fr) 2022-08-31

Family

ID=68392969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19795505.7A Pending EP4048961A1 (fr) 2019-10-23 2019-10-23 Dispositif de détendeur destiné à un circuit de réfrigération ou un circuit de climatisation

Country Status (2)

Country Link
EP (1) EP4048961A1 (fr)
WO (1) WO2021078375A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579380A (en) * 1980-06-20 1982-01-18 Hitachi Ltd Proportional control valve
JPH0624282U (ja) * 1992-08-28 1994-03-29 株式会社不二工機製作所 電動流量制御弁
EP0689015A1 (fr) 1994-06-21 1995-12-27 Staefa Control System Scs Ag Vanne de régulation avec servo-entraînement
DE102017122624B4 (de) 2017-09-28 2019-08-14 Pierburg Gmbh Expansionsventil für einen Kälte- oder Klimakreislauf

Also Published As

Publication number Publication date
WO2021078375A1 (fr) 2021-04-29

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